feat: implement inventory coverage truth (#208)
## Summary
- implement Spec 177 inventory coverage truth across resolver, badges, KPIs, coverage page, and operation run detail surfaces
- add repo-native spec artifacts for the feature under `specs/177-inventory-coverage-truth`
- add unit, feature, and browser coverage for truth derivation, continuity, and inventory item filter/pagination smoke paths
## Testing
- `vendor/bin/sail bin pint --dirty --format agent`
- focused Spec 177 browser smoke file passed with 2 tests / 57 assertions
- extended inventory-focused test pack passed with 52 tests / 434 assertions
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #208
ahmido
f52d52540c